Negative Charge Carbon Dots Manufacturing Electrostatic Shielding Layer for Stable Zinc Anode

Kai Wang, Jinqiang Gao, Huaxin Liu, Weishun Jian, Jiangnan Huang, XinYu Hu, Siyuan Lai, Yafei Li, Guoqiang Zou, Hongshuai Hou, Wentao Deng, Xiaobo Ji
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Abstract

Alkaline zinc-based batteries (AZBs) can yield higher operating voltages due to a more negative electrode potential of zinc metal in alkaline electrolytes compared with neutral electrolytes, delivering high energy density in practical manufacturing applications. However, AZBs also exhibit more pronounced problems due to severe corrosion of the zinc anode by the strongly alkaline electrolyte environment. Combined with the reaction mechanism of alkaline zinc batteries, negatively charged carbon dots are innovatively used to construct a barrier with both physical and chemical effects. Zinc anode exposure to electrolyte is reduced by superior barrier, which assures transmission of zinc ions rather than zincate ions through electrostatic force balance, thus improving the distribution of the electric field for zinc ion deposition as well as avoiding accumulation of zincate ions at the interface. The number of harmful dendrite formation was found to be significantly suppressed by in situ optical microscopy. When coupled with silver oxide cathode for testing, the assembled silver-zinc battery results in a significant enhancement in its cyclic life. It is believed that this study will propel the development of zinc anode in alkaline batteries and provide new insights for their application.

Abstract Image

负电荷碳点为稳定的锌阳极制造静电屏蔽层
与中性电解质相比,碱性电解质中锌金属的电极电位更负,因此碱性锌基电池(AZB)可以产生更高的工作电压,从而在实际生产应用中提供高能量密度。然而,AZB 也会因强碱性电解质环境对锌阳极的严重腐蚀而产生更明显的问题。结合碱性锌电池的反应机理,带负电荷的碳点被创新性地用于构建具有物理和化学效应的阻挡层。锌阳极暴露在电解液中的机会因卓越的阻挡层而减少,阻挡层通过静电力平衡确保了锌离子而非锌酸根离子的传输,从而改善了锌离子沉积的电场分布,并避免了锌酸根离子在界面上的积累。原位光学显微镜发现,有害枝晶的形成数量明显减少。在与氧化银阴极一起进行测试时,组装后的银锌电池的循环寿命显著提高。相信这项研究将推动碱性电池中锌阳极的发展,并为其应用提供新的见解。
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CiteScore
17.30
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